I have reset the codes, only one that comes back is the pin4 EGR code (5).

Using the mityvac, no vacuum leaks. Applying vacuum to the EGR valve doesn't change the idle, but releasing the vacuum will make it slap shut as previous posts suggest it should.

So is it not closing all of the way, or clogged and not opening? Only way to tell R&R?

TIA.

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